It's not so heavily frowned upon in public schools I found. Certainly on the books it's a no-no, but how often do things get done about it?
The vast majority of the trouble kids get into in private schools 'round here has to do with sex and drugs, not so much violence. Vandalism I guess is violent..? But it doesn't count.
"George Bush says he speaks to god every day, and christians love him for it. If George Bush said he spoke to god through his hair dryer, they would think he was mad. I fail to see how the addition of a hair dryer makes it any more absurd."